//
//  WelcomeViewController.swift
//  微博项目
//
//  Created by mac on 16/1/17.
//  Copyright © 2016年 mac. All rights reserved.
//

import UIKit

import SnapKit
import SDWebImage

class WelcomeViewController: UIViewController {

    override func loadView() {
        view = backImageView
    }
    
    //推荐在ViewDidAppear 中执行动画效果
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        showAnimation()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setUI()
    }
    //子视图
    
    private func setUI(){
        self.view.addSubview(headImageView)
        self.view.addSubview(welcomeLabel)
        
        //设置约束
        headImageView.snp_makeConstraints { (make) -> Void in
            make.bottom.equalTo(self.view.snp_bottom).offset(-160)
            make.centerX.equalTo(self.view.snp_centerX)
            make.size.equalTo(CGSize(width: 90, height: 90))
        }
        
        welcomeLabel.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(headImageView.snp_bottom).offset(10)
            make.centerX.equalTo(headImageView.snp_centerX)
        }
            
            //头像的圆角设置
            headImageView.layer.cornerRadius = 45
            headImageView.layer.masksToBounds = true
        
        //隐藏文案
        welcomeLabel.alpha = 0
        
            //显示用户头像
            headImageView.sd_setImageWithURL(UserAccountViewModel().headImageURL,placeholderImage: UIImage(named: "avatar_default_big"))

    }
    
    //MARK: 显示动画效果
    private func showAnimation(){
        let offset = -UIScreen.mainScreen().bounds.height + 160
        self.headImageView.snp_updateConstraints { (make) -> Void in
            make.bottom.equalTo(self.view.snp_bottom).offset(offset)
            
        }
        UIView.animateWithDuration(1.5, delay: 0, usingSpringWithDamping: 0.98, initialSpringVelocity: 9.8, options: [], animations: { () -> Void in
            //放在代码中执行 并且需要在修改约束之后调用
            self.view.layoutIfNeeded()
            
            }) { (_) -> Void in
              //显示文案
                UIView.animateWithDuration(0.6, animations: { () -> Void in
                    self.welcomeLabel.alpha = 1.0
                    }, completion: { (_) -> Void in
                        print("OK")
                        //发出显示首页的通知
                        NSNotificationCenter.defaultCenter().postNotificationName(WBSwitchRootVC, object: nil)
                        print("come here")
                })
        }
    
    }
    
    //懒加载子视图
    private lazy var backImageView : UIImageView = UIImageView(image: UIImage(named: "ad_background"))
    //用户头像
    private lazy var headImageView: UIImageView = UIImageView(image: UIImage(named: ""))

    
    
    private lazy var welcomeLabel: UILabel = UILabel(title: (UserAccountViewModel().userName ?? "") + " 欢迎归来", fontSize: 18, color: UIColor.darkGrayColor())
    
    


}
